# create_time:  2021/5/10 16:39
import re

from rest_framework import serializers
from .models import User, Address
from django_redis import get_redis_connection
from rest_framework_jwt.settings import api_settings
from celery_tasks.email.tasks import send_verify_email


class CreateUserSerializer(serializers.ModelSerializer):
    """注册序列化器"""

    # 序列化器的所有字段：['id', 'username', 'password', 'password2', 'mobile', 'sms_code', 'allow']
    # 需要校验的字段：['username', 'password', 'password2', 'mobile', 'sms_code', 'allow']
    # 模型中已存在的字段：['username', 'password', 'mobile']

    # 需要序列化的字段：['id', 'username', 'mobile']
    # 需要反序列化的字段：['username', 'password', 'password2', 'mobile', 'sms_code', 'allow']

    password2 = serializers.CharField(label='确认密码', write_only=True)
    sms_code = serializers.CharField(label='验证码', write_only=True)
    allow = serializers.CharField(label='同意协议', write_only=True)
    token = serializers.CharField(label='token', read_only=True)

    class Meta:
        model = User
        fields = ['id', 'username', 'password', 'password2', 'mobile', 'sms_code', 'allow', 'token']
        extra_kwargs = {
            'username': {
                'min_length': 5,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许5-20个字符的⽤户名',
                    'max_length': '仅允许5-20个字符的⽤户名',
                }
            },
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
        }

    def validate_mobile(self, value):
        """单独校验手机号"""
        if not re.match(r'1[3-9]\d{9}$', value):
            raise serializers.ValidationError('手机号格式有误!')
        return value

    def validate_allow(self, value):
        if value != 'true':
            raise serializers.ValidationError('请同意用户协议!')
        return value

    def validate(self, attrs):
        """校验两个密码是否相同"""
        if attrs['password'] != attrs['password2']:
            raise serializers.ValidationError('两次密码不一致!')

        # 校验验证码是否正确
        redis_conn = get_redis_connection('verify_codes')
        real_sms_code = redis_conn.get('sms_%s' % attrs['mobile'])
        # 向redis存储数据都是以字符串存储的，取出来后都是bytes类型，所以需要解码
        if not real_sms_code or attrs['sms_code'] != real_sms_code.decode():
            raise serializers.ValidationError('验证码错误!')
        return attrs

    def create(self, validated_data):
        # 把不需要存储的数据从字段中移除
        del validated_data['password2']
        del validated_data['sms_code']
        del validated_data['allow']
        # 把密码先取出来
        password = validated_data.pop('password')
        # 创建用户模型对象，给模型中的username和mobile赋值
        user = User(**validated_data)
        # 把密码加密后再赋值
        user.set_password(password)
        user.save()

        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER
        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)
        user.token = token

        return user


class UserDetailSerializer(serializers.ModelSerializer):
    """用户详情序列化器"""

    class Meta:
        model = User
        fields = ['id', 'username', 'mobile', 'email', 'email_active']


class EmailSerializer(serializers.ModelSerializer):
    """更新邮箱序列化器"""

    class Meta:
        model = User
        fields = ['id', 'email']
        extra_kwargs = {
            'email': {
                'required': True
            }
        }

    def update(self, instance, validated_data):
        """重写此方法目的不是为了修改，而是借用此时机，发送激活邮箱"""
        instance.email = validated_data.get('email')
        instance.save()

        # 发送激活邮箱,利用celery异步处理
        # http://www.meiduo.site:8080/success_verify_email.html?token=1
        verify_url = instance.generate_email_verify_url()
        send_verify_email.delay(instance.email, verify_url=verify_url)

        return instance


class UserAddressSerializer(serializers.ModelSerializer):
    """
    ⽤户地址序列化器
    """
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label='省ID', required=True)
    city_id = serializers.IntegerField(label='市ID', required=True)
    district_id = serializers.IntegerField(label='区ID', required=True)

    class Meta:
        model = Address
        exclude = ('user', 'is_deleted', 'create_time', 'update_time')

    def validate_mobile(self, value):
        """
        验证⼿机号
        """
        if not re.match(r'^1[3-9]\d{9}$', value):
            raise serializers.ValidationError('⼿机号格式错误')
        return value

    def create(self, validated_data):
        user = self.context['request'].user
        validated_data['user'] = user
        return Address.objects.create(**validated_data)


class AddressTitleSerializer(serializers.ModelSerializer):
    """
    地址标题
    """

    class Meta:
        model = Address
        fields = ('title',)
